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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46d79595e8eacae31b863ecd06ab207c8cc69ce02c1cb61f5701ac963db87c2a' 
  AND token = 'cQk0+A4SIfQO3nCBHy+2YqwXF5e8B1UWtx0j6A2DB9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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