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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63ded5ec0dd22cf4bf5cbac35a203dedbe68ad39722e4e12629e08b74099b2b0' 
  AND token = 'Q4oRx8Rqj8RGrJIlpHk+CFuibLwA4T8YPrHs01lE14g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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