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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39e6cbe955bc30855958a3d82b4dc732e9c6f46e455da28c78511fec1610e447' 
  AND token = 'ybalV/fJnLK8y4Y+VvHX1pv1K7RHJS5+8QNuUDOWKsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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