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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87ad7b0f321b25b3c3024a462beffde4b5f92daf2387f059fd31bf7d2b7fc0bd' 
  AND token = 'LyniVrSGR9IdeIk93WxExBsRHvyrkCo/mC6GKnFjucc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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