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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d5457ed89b705519712acfdad84b3f0bb65f7509448e361312039ee026bae6c' 
  AND token = 'U+47gyXTgEnCVyrFwEn0Frau0NPs66XnSwGEmohSH74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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