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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30e0c03667aeb5f8006a7d4a86437d9affde120c1c5c3c531ba2808e98cd4cb0' 
  AND token = 'a+QtFV/uOSJqRnRfQYd5+ZfB24/rbQ/RNzZfkxVaYkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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