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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82e1ef4a0c4c3b0d330686eee4d6f69076e814c5883065036db2782293818979' 
  AND token = 'XXHe3aJSco5/Kerkwt+Fs7SGKRpD3iNefyDG8AksFwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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