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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f09036e25e5f3abab4f6c74ae6a18eac1efb267c0998ac6bc744785f4095721' 
  AND token = 'dIaGHj8mhZ03rZfoaufCnXtDk5Pu8PocOll11MJ1flk=' 
  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"
    }
  }
}