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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7a3ea4bf74840e87dbf4341cb222bc7b9cc69aa1395e739910d2dc2b8fd673b' 
  AND token = '/ZYPEPPh/Nv5yODIssapu/yc9Wo7XpTvkjwfD60H9/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00085

JSON explain

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