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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8592a3648e9c7b46d2ae379afb29683facdfa1379318f3e3820c4de9adf35da' 
  AND token = 'p9ASba6GGxXRtPpJ9mLA6GvaLsvxKVJjOkLA3H2xfIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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