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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8033e3fb2b4d50c8bc7f15ae13296d444e51de5b2fe1d2103a2dc31b9874d26c' 
  AND token = 'DkZbv0nM69mtzy2vAGL4T5R6qrkLQDUq1E002nqjQzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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