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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ba007fbb1b855ea64c456adc3e66005d822a355fcb3100602a76e3ea7185796' 
  AND token = '0Iq9yOxdcshPstdkHQzirvD6EI88eKujGGqYpksIAyM=' 
  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"
    }
  }
}