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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd00ec7c78853eac75fc21447d646eb9177f382f1fdace8919c2f097f7f4098f' 
  AND token = 'hlG4uQ3cqRd8sDu3myu1wvmm/02Gh0/TYy6PgdN24nM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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