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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffb41a269c5a2f4adfb7e155ecc895c0f51d9be01b7ed3bf9d2c3a7b9737022b' 
  AND token = 'JoKASKwa3MWm1RWK1SSZS2CyW044qKq231DiyD2z4U8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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