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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f13b3ea06377d9bb9d4752d6eab7a110ee4de06c5bdff7d180026ba9e33e58ac' 
  AND token = 'T/FZc+T4dtkgueY2Z9Z7HCrZyQ0w/Dm4w6vXvE/XlDA=' 
  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"
    }
  }
}