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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd74b5409f3ab0ec44357efda65a15eadbd1466b4ec47e5c4aa31576f9eac46c4' 
  AND token = 'AB3vxb+04r737CxKg1FaxEb0JF+7M0sqBBcGTXtnuA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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