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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a81fc932e3633082c1abf300e8285901e330cc51a5d72a7b1c0ee577fa98ca2' 
  AND token = 't8WhVVwH2JGVauFtl88sfR2N24ikWuBBP1A0geNMUeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00091

JSON explain

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