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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '796e3d2a92919bde2ca02013f5ec18683ce54820a246d7495997bd7e10e4f19d' 
  AND token = '2gcz7dK1V7gtz52ti4QQ6u2oVgg60rTLYXy8rIDCvBM=' 
  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"
    }
  }
}