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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e091bf4954d449d4216027206b5fbef9fa084d96ccea1075a2353f84e5d5c127' 
  AND token = '7IC2iIYLUDgoZ8YkMja/Yj8aFbqIeFBlq3D14PVep38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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