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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4630b746d6ea2bc373023ffb29e5b7ca636f23b50cd924e538e6abcf4a4fee0c' 
  AND token = 'unFd+K0/Mes2YpzDKihDfDRcbpvOZWTDbb8Ou3wNDW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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