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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa6d1d629b993be52e53102c9bb44bf4cc25ed8a497de3b14ecd4209d9e12aec' 
  AND token = 'VUPBqwz8Gu9G+lBQhe8+3f0htnQHd8MTWuQO7qVawGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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