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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b6acb9fb1d2f8db3375511ddc655b2f988e106633fa02a22b3ee9f2c8ce467e' 
  AND token = '2u3XH3xFAuP2TYUiONfbK7Y3luXnulzon7U+fS1GBQg=' 
  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"
    }
  }
}