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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27e86c03d6c86c26f780e0ccdd357e07d3b8ba675ae006430f266fbdbdba4a2d' 
  AND token = 'S/lUYSRG2UCLy+kzpxX9fS+fyNM+v/5Ofp58qHWP6AA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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