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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '246b38f26464012e4b15e0d37d6b368f792b1ccb72f033f10e00ae8b2990cc1c' 
  AND token = '0x9hHN1Duhi8+y3GcfNedn5YkJOzadWm9MK2TKSu2/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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