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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70ea920f849fb5bbb2b18d48ce5a61307378ee115bbbb51f989bea2b8c37775c' 
  AND token = 'KVg9GoXRXmCeFtuxzTrbzqD/SVuqChM/yr1wESh7SEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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