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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ab1f3dd10b5bfe67d10162f4c566ede0530edcffeefe4256a20d5deebf6bee3' 
  AND token = '8Nf5aOTJL3uz02M7yG4+A5V1P5Oar8USfQi+3Njm6cE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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