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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bedb1ed2bc1ecf1c2d75aaacd2bc45f5ec9871eaae3e88299e4be1f242e5f62' 
  AND token = 'itdwIuXhW5PAtrs7DLbVWvqbi1XRr/ycBY0+XjuY8r4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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