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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d01fb3497bb9b1558ed5832f89a6e6961e2645bd1a227a23fc4410ca3c99493' 
  AND token = 'NkmOt2n21Ls5yMV9lhxIm55LUVWPwTZIBZua9KUW0nY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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