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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76f1ec03ebbd54e05c16ded90bcb5cfa05a6724914eefe01d7e99d5660c2a8c9' 
  AND token = 'P8J3k6aAtelVeSGoUwvEmzDKvc1jHvEb9V4gJht3H0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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