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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '178fdaa9005c136dc3e69eaf36257e17f2fa4e1cee39e7b3c593747d955c3510' 
  AND token = 'KwEP0HsFzmLmaPuqZuczV68iggmOwf6DQnRp93tzNtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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