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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '863a0c7a8efbc9cb726be0241e466d744f8ac237508a608de8dd285b47f111e5' 
  AND token = 'knRts8+w6c2cFuH//m5xptLARPe5j7kA3iiOo+IV0Dw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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