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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c410e661c08b15668915ca13f774919761daf7b464fcb89f3dfca3b88882cde' 
  AND token = 'maZBxqyh95C537YTWxYQM0kMWmFOU+bUIP0xRej5KgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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