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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '483feb42b9f8458cc05f74bdc1ce4376f9d28b25de9d17f602f1df14d51f237f' 
  AND token = 'sRSoGZ4iWi+L3W50eCUTtKg//2CvuG1yUQiWlsBKfqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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