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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf7bb044b15d5b2901ba68bad08c8502d84f176a7ca6df36cc52856feef4a0d4' 
  AND token = '8IkZA+pcmgLGQ2ufbCwNJsrRbZNQx2KwCcaFy8r1Q8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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