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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cbc654eda4da2c7831be6556cbb18896a2f0f286f5c2c28a895092562d24cf0' 
  AND token = 'O65ewgsYjgI8lr8+NrK56l6D+JbrSakOE3njKvnOEZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}