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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '334375a04a47fefbd891008a966b631b49e8af116800707093bc0fdc7722a49f' 
  AND token = 'UtDcV8zWWGoDm+pHNWhUMxQR61AGRzyz1P4fTITn3D4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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