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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea3bc11057a6088e61e20322f32ea4ed87a4cadafd1d6c1567e003eafca8e888' 
  AND token = 'aT+zhLq9lt2XI3DhIWOPnOBXz3r9ULm4iJ9qBW0ocNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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