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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3418341927ab92ec5ad2c609564038872172a13bd27fb83788af8de57469d579' 
  AND token = 'YpvlQI6kT1Gc2G5XBbuSU0a8jwDzD0O7fnzUSF4kpzY=' 
  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"
    }
  }
}