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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b6ed8156cf47bb007fda4ff964b4df34dee95a74f348190696dd63b416d52a3' 
  AND token = 'VNvCZu5VT7krh3n1jdCI+Jr/NRWdedwB479qfEQVQYQ=' 
  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"
    }
  }
}