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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d477d29e517b03cb73cc4961a00d29a6c22de0d0512d4e3c66bca03c271ce4f' 
  AND token = '7uczu9MU3vExAkGJ3RbY+UwWE0k5pYsiT0BsK02kpKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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