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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef696bda2b10d5c28f3d64a5ca802ce7b151d913e5b52f7da49441cbd4c4cbc8' 
  AND token = 'oZ47QsGXLvagdaJx9OTgm5XYaQKpgkbEfb01CCJJRtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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