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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23b95c6f0e1e91c65cef8cea79f00e0799e83d7ad96679e8e7de903ec01e657a' 
  AND token = '4czqjv8y/TAAQh42xaW/3MTQ2kLEoW/00D7Ij+aHoRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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