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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '583d0016074569c2ba5fc2d19b33fa2a17b057291add5324758fa326027e4698' 
  AND token = 'V87oYwSlq/hMEtWiUS/u4DS4tjbomRz9rofEqjn1A6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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