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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e3187fee92f332cd0b9f75365b0a7d22cfbf067dd3a5739b52a7e3977da2695' 
  AND token = 'yifwQ8E40Ea3YfTuTR3UPTfLV7de0/u5kBHu2H4FNoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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