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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5cb3042284caa58be1c02ef02b571e4c5d5290523b3715d4760cba585e13c37' 
  AND token = 'EdyqNeiP+1A+nniNv2wKl1IbjFEBLFbLXZ3nkDL8HJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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