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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f650028fbfa089ef856f8f34c2f7695ce40b9c093edc4e9f9e581f768620429' 
  AND token = 'LwW4s9T2WdUI8YHHeBH2KWWz5AvgpCCR+hx+9hhWv94=' 
  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"
    }
  }
}