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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0e9dd3a7318e6df73b26a47104490a09f0ef9801a0d7507cd5b6c1ab3b5e930' 
  AND token = 'haD9a6MEDqLN+eCtdlKSRDcnPH1jErB9/6LKcAW4fYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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