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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72552a722e5f3c39f88d72f7a7596b725f3135389ad6808fa86ed77f6a8b3743' 
  AND token = 'mm/ayD5rKXmfHnpv9wDyQvd4RFFYowC0eJp8p9wQHi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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