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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a065e0c4311f3a6add6114264d86d44c590537906b40fb15ab90f3c7984f4b0' 
  AND token = 'uQ4uJ9+JH/Qv9wsaK4ZM5FZiIzbMmHS/tEWeydST96Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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