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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71f4587a10ae20e184e57ce2cf689631a6b2f7c33add52d96eda3f2f0a6928e4' 
  AND token = 'zC3lYuLf88GFIvlu9IALgGxewgYC6BIOseq0Do/u4Y0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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