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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35d58e1c09d4ac3a35e5592aea5596a160c649d6f0c406d38a301e17b91aba85' 
  AND token = 'Nl0uEBgCIvLc/6Sh12SXtJUMlxL/JgpuYHfxf1owpKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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