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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f30a2cd58a5e23a8c53466ecbd9a2e5bdc0bd92e258777a733e7ac2edaa4e06' 
  AND token = 'q8WFtUAinz8z1NlkWTUSpSI8Fgznkpk8EKco97oP8LY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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