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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4d57073120d457607398042c722e19057479db183fad8be0eaf8aeae389a376' 
  AND token = 'yWIPiCwR58bZX+7+UJ/68X+3samy+xkyo/ofjCCmb4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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