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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af6cbea49b09b88ab56eb41bc5e687caca42d6daa3370f7236705e9eab9cdf7c' 
  AND token = 'hKsBumiPsQ8rDxmQj55VJdRapi8fyr0FR70aj8qfyf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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