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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74a7004b50f0fa96edd553a69f4b3d2c255ab0adcd815be694d6d6288342ff44' 
  AND token = 'e7XCM1pYwAcn9BlCu5anbI+6mj3c4ooogk8zNNcDO7k=' 
  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"
    }
  }
}